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S3 Page (Advanced Site Settings dialog)
The S3 page on the Advanced Site Settings dialog allows user to configure Amazon S3 protocol specific options.
To reveal this page you need to select Amazon S3 file protocol on Login dialog.
Refer to documentation of page sections:
Protocol Options
Use Default region to specify the default region for an authentication and new buckets. When no default region is specified, us-east-1 is used.
Further Reading
Read more about Login dialog and Advanced Site Settings dialog.